Dental massage-tool



, W. L. JONES.

DENTAL MASSAGE TOOL. I APPLICATION FILED AUG- 14. 1916.

Patented May 25,1920.

UNITED STATES PATENT OFFICE.

WILLIAM L. ONES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO VIBRO- DENTAL PRODUGTS, INCORPORATED, A CORPORATION OF PENNSYLVANIA.

DENTAL MASSAGE-TOOL.

Patented May 25, 1920.

Application filed August 14, 1916. Serial No. 114,717.

To all whom, it may concern.

Be it known that 1, WILLIAM L. J ONES, a citizen of the United States, and resident of Philadelphia, county of lhiladelphia, and State of Pennsylvania, have invented an Tmprovement in Dental hliassage Tools, of which the following is a specification.

The object of my invention is to provide a dental tool for use with the usual hand piece of a dental engine, by which said hand piece may be extended and provided with a reciprocating plunger for a massaging device suitable for massaging the gums, and means for transforming the rotary motion of the mandrel of the ordinary hand piece into reciprocating movement of the plunger of the massaging tool.

My object is further, to. form within the extra or extension hand piece, a spring actuated massaging plunger and rotary means for reciprocatingsaid plunger, the exten sion hand piece having engaging means for the usual hand piece of a dental engine and the rotary means having an extension to be received in and detachably clamped in the tool chuck of the said usual hand piece.

My object is also to provide a massaging tool for a dental engine which shall be light in construction, simple, inexpensive and readily capable of being dismantled for access to the operative parts.

With the foregoing objects in view, and others referred to hereinafter, my invention consists in certain constructions and combinations of parts which are fully described in the following specification and more particularly recited in the claim.

Mry invention will be better understood by reference to the drawings, in which :,Figure 1 is an elevation of, a dental tool holder with my improved massaging tool applied thereto; and Fig. 2 is a sectional view of a portion of the same on a larger scale.

1 is the usual hand piece of a dental engine and is provided with the rotary chuck 2 of any suitable construction, said chuck journaled' in the hand piece and driven by a belt (not shown) passing about the grooved wheel 3 on the chuck spindle. The part 4: constitutes the usual wrist joint of the oint ed arm of the dental engine, and guides the belt about the grooved wheel 3. The chuck may be adjusted to clamp the tool by the adjusting milled head 5, as usual. These parts are shown by way of example only, as the chuck may be driven by a flexible shaft as is more common in electrically operated dental engines.

The massaging tool embodying my invention has a casing constituting an extension of the hand piece 1 and comprises a sleeve 6 screwed upon a neck 8 having the case 9, terminating in the plunger chamber 14.

The sleeve 6 fits over the end of the hand piece 1 back of the chuck 2, and has a slot 6 in which a screwhead 6 on the hand piece is received (Fig. 2), and in this way is held against turning. The neck part 8 constitutes a bearing for the rotary spindle 7 whose rear extension projects through the sleeve 6 and is received in the chuck 2 and clamped therein, whereby it may be rotated with the chuck. The other end of the spindle 7 is fitted with a disk 10 secured at an oblique angle to the axis of the spindle, this disk being greater in its oblique diameter than in its transverse diameter, so that its perimeter may be concentric to the axis of the spindle 7. This disk 10 is arranged within the body of case 9 and is rotated therein by the chuck.

The plunger chamber 14 preferably tapers and has its larger end provided with a eylindrical hub 1 F which fits into the case 9 and is secured'thereto by screws 18. The other or smaller end of the plunger chamber 14 is internally screw threaded and fitted with a bushing 17 which also constitutes a bearing for the reciprocating plunger 12. The lower end of the plunger 12 is arranged to reciprocate in the hub 1 1 as a bearing, and is provided with a collar or flange 12 which limits the inward stroke of the plunger. A coil spring 13 surrounds the plunger, one end pressing upon the annular collar or flange 12 and the other end pressing against the inner end of the bushing 17. In this way, the plunger 12 is spring pressed inwardly, but it is provided on its end with a bent finger 11, the lower end of which is rounded and fits to the surface of the rotating disk 10 near its perimeter so that said disk imparts to the plunger an intermittent outward movement in opposition to the springs action. To prevent the plunger rotating, it is provided. with a longitudinal groove 12 in which one of the screws 18 fits. It will now be understood that as the spindle 7 and disk 10 rotate, the cam action of the latter upon the finger or plunger extension 11 causes said plungerto have a,

rapid reciprocation. This reciprocation is.

n as positive manner in the outwardjthrust, but viel'dmgunder the U spring action on the lnward movement. 1

The outer end of the plunger 121s bored and screw threaded, and receives the thread ed end of the shank 15ofthe massaging device 16, said shank l5pre'ferably being of a diameter equal to that of the plunger, and the end of the bushing extendingbeyond the part 14 to provide a shield to thejoint be- 7 tween thep'lungerand shank. I The massaging device shown is a rubber cup, but the shape ofthis part may be varied to suit the character of massage to "be g ven to the gums. I

The general construction Of'tllG casing of the massage tool may be modified butas shown it is easily I separated into parts so that allthe operative portions may be re i moved and repaired and said casing, becomes 5 r :ivhich I have employed an extension .to the hand, piece of theengine 7 being held; against. rotation thereon and clamped to itv by the engagement of the shank or rear extension of thespindle 7 in the chuck 2 of the hand piece. I 7 I have shown my inventionin the form I in practice and which I have found well suited to the purposes intended; and While I prefer the same, I.

Without departing of the invention, V Having now described my invention, What desire to secure by Letp ters Patent, is r I ea set;

not restrict myselfto the details there} of, as these'may be varied andmodified from the spirit or scope I claimasneW and 7 Ina deviceof the character stated; "2L'Il 6X tension hand piece arranged for being detachably connected WVltll thev usual hand 7 piece and rotary chuck of adental engine, combinedjwitha rotary sp1ndle.1n the :eX-

tension hand piece having anrextension for engagement in the chuck, a reciprocating plunger inthe free end of the extension hand piece provided with a tool holding ,end, a spring continually tending to force thefplu'nger inward,means Within the extension hand piece ior lmpart ng a. positive reciprocat-ing .motion outward and acon- 7 v trolled inward movenient to cthe plunger,

said means actuated by the rotary motion of the'spindle, and means against rotation. p I V In testimony of which invention, I hereunto set my hand. a

QW LLIA L. JONES.

to hold the plunger l/Vitnesses V t JOHN BURKHARDT, I V HOWARD R. JONES. 

